condition mean min max ZT0-3 15.566189 15.566189 15.566189 ZT4-7 13.7963785 13.7963785 13.7963785 ZT8-11 11.5793185 11.5793185 11.5793185 ZT12-15 13.5971635 13.5971635 13.5971635 ZT16-19 9.8772385 9.8772385 9.8772385 ZT20-23 10.0245615 10.0245615 10.0245615